Valve-lifter



N. G. LARSON.

VALVE LIFTER.

APPLICATION FILED FEB. 19, 1920.

mmm Jun@ 7,1921,

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NILS G. LARSON, 0F ATTLBORO, MASSACHUSETTS.

VALVE-METER.

Specification of Letters Patent.

Patented June 7, 1921.

Application :filed February 19, 1920. Serial No. 360,015.

they city of Attleboro, in the county i of Bristol and State ofMassachusetts, have invented certain new and useful Improvements inValve-Lifters, of which the following is a specification.

rIhis invention relates to so-called valve lifters of the type adaptedto compress valve springs suciently to permit the stem pins to bereadily extracted so that the valve may be freely removed; and the object of this invention is to provide such a device arranged 1 to engageeither one or two valve spring members to raise the same and hold thesprings under compression during the removing and repairing operationson the valve.

A further object of the invention is to so construct the device that itmay be caused to env'age and operate upon two adjacent valve springssimultaneously, and at the same time be so positioned as to permit freeand unobstructed operation upon the valve.

A still further object of the invention is that the lifter is adapted toraise or compress the springs in a straight line and so eectuallyprevent cramping the same or displacing of the spring during'the liftingoperation.

lilith these and other objects in view, the invention consists ofcertain novel features of construction, as will be more fully described,and particularly pointed out in the appended claims.

In the accompanying drawings:

Figure 1 is a side elevation illustrating my improved lifter as lappliedto the valve springs of an engine.

Fig. 2 is a perspective View showing the inner side of the fulcrum post.

Fig. 3 is a perspective view of the camlifting member.

Fig. l is a perspective view of the springengaging cross-bar member.

Fig. 5 is a perspective view of the fulcrum in. p Fig. 6 is a sideelevation illustrating the complete device, showing the cross-bar andcam in full lines, as being in down position and in dotted lines in upor raised position.

With reference to the drawings, 10 designates the cross-bar member whichis shown as being of a length suilicient to engage two adjacent valvesprings, the same vbeing out out at 11 and 12 onone edge to fit aroundthe valve stem 13.

The center portion of this bar is preferably bent or formed to extendupwardly providing two verticallydisposed side walls 14E' i spaced apartat 15 and connected at their upper ends by a bridge portion 16. Each ofthese side walls is slotted as at 17 to permit the passage of the pivotor guiding bolt or pin 18 which is adapted to slide therein.

rIhe fulcrum post 19 is preferably formed with a-channel and is adaptedto engage one of the side walls 14 of this cross bar to guide thevertical sliding motion of this bar, the lower end 2O of this post beingadapted to rest upon the cylinder block 21.

At the upper end of this post I have pivoted a cam member 22 which isalso adapted to work in the space 15 between the vertical side walls 14of the cross-bar. This cam is pivoted by this fulcrum pin 18, itsworking edge being adapted to engage the under side of the saddle orbridge portion 16 of the bar, and this cam is provided with a handle 23by the action of which the cross-bar may be raised and lowered.

The operation of the device is as follows Vhen it is desired to operateupon two of the valves it is only necessary to throw my cam handle down,place the fulcrum bar on the cylinder block, as illustrated in Fig. 1,and then pass the bar beneath the spring cups 24 of the springs 25, theupturned corners 26 of this bar serving as positioning stops. Then bylifting the handle from the position shown in full lines in Fig. 6 tothe position shown in dotted lines in this figure, the edge of the cam22 is caused to ride beneath the bridge 16 and raise the cross bar andthe springs into the position illustrated in Fig. 1, in whichpositionthe stem pins 27 are released and adapted to be readily removed and sopermit'the valve to be taken out for examination and repairs.

By the use of my improved device I am enabled tooperate upon a singlevalve spring if desired without engaging both of the adjacent springs.

It will also be noted that by my improved device the lifting motion isin a direct or straight, vertical line and not on a curve or circlewhich is usually the ease with the ordinary valve-lifting devices,thereby eectually avoiding gripping or binding the stems and alsodisplacing the springs; the device may lift into position and hold thesprings compressed during the time that the valves are being operatedupon and repaired permitting them to be readily'replaced as many timesas desired and when inally in condition the stem pins may be positionedand the springs dropped into engagement therewith Without loss of time.

rlhe foregoing description is directed solely toward the constructionillustrated, but I desire it to be understood that l reserve theprivilege of resorting to all the f mechanical changes to which thedevice is susceptible, the invention being defined and limited only bythe terms of the appended claims.

I claim: Y Y l l. A valve lifter having a fulerum post, a cam pivoted insaid port, and a spring engaging member guided on said post and adaptedto be operated by the movement or' said cam to compress said spring.

2. A valve lifter comprising a ulcrum post, a spring engaging cross-barhaving an upwardly-extending portion guided on said post, a cam pivotedin said post and arranged to engage and lift said bar, and an operatinghandle on said cam.

In testimony whereof l affix my signature.

NILS G. LARSON.

